Geography Reference
In-Depth Information
A map appears—distorted in a different way from the previous one. The reason it looks strange is that
the latitude and longitude coordinates that are natural to this dataset have been converted “on the fly”
(meaning instantaneously, for display purposes) to the Kentucky state plane coordinates. Those coordinates
work reasonably well in the middle of America, but not elsewhere, particularly, as you note, in Alaska. In the
next step you will find the Kentucky north zone, isolate it, and export it as a shapefile all by itself.
24.
Zoom in on Kentucky (KY), using Identify if necessary. Zoom in on its north zone. Use the
Identify tool to make sure you are in the correct place—the ZONENAME83 should be in KY_N.
What is its FIPSZONE83 number? ________. To the nearest tenth, how many square miles are in
the zone? ____________.
25.
From the Tools toolbar, pick Select Features by Rectangle. Click the north zone. It should now
have a thick, colored border. Right-click usstpln83 in the T/C. Click Data > Export Data. In the
Export Data window, make sure that you are about to export Selected Features. Press the radio
button to select “Use the same coordinate system as the data frame” so that the north zone
will be changed from geographic coordinates to state plane coordinates. For output, browse to
___IGIS-Arc_
YourInitials
\Digitize&Transform
and make the name KY_N_sp83.shp. Make sure your “Save as type” is set to shapefile. Click
Save, then, after checking that it looks like Figure 5-1, OK the Export Data window. When asked
if you want to add the data to the map, select Yes. Remove the layer usstpln83.
FIGURE 5-1
26.
Using the Select Elements tool as a cursor, slide the cursor around the map. Verify that the
map display is in feet - if not, change it. Imagine a rectangle around the entire north zone.
Consider the north-south line that is west of the entire zone, and whose easting is a nice round
number like 1110000. Write it down below, along KY_N_with three other boundaries (again with
round numbers):
Western boundary: _________________
Eastern boundary: _________________
Search WWH ::
Custom Search